[. . . ] MOUNTING THE LENS A Position the lens in the camera's bayonet mount, aligning the mounting indexes on the camera and the lens. To remove, depress the lens release button on the camera and twist the camera counterclockwise. [. . . ] 12 ZOOMING C To zoom in or out, look through the viewfinder and slide the focusing ring back and forth until the desired composition is framed on the focusing screen. As the ring is pushed forward for shorter focal lengths, a sevenposition scale is uncovered on the lens barrel to show which focal length the lens is set for. To preset the lens for a specific focal length, align the edge of the focusing ring with the white line along the appropriate number. DEPTH-OF-FIELD SCALE D A group of colored lines, curving out toward the front of the lens, is engraved on the lens barrel. To find the depth of field at a particular focal length and aperture, first compose and focus the lens on the subject. Then check the numbers on the distance scale opposite the colored lines to find the depth of field at that aperture. The colors of the pairs of lines correspond to different lens apertures. You can also observe the depth of field through the viewfinder by pressing the depth-of-field preview button on the camera. INFRARED PHOTOGRAPHY D In infrared photography, the plane of sharpest focus is slightly more distant than the one produced by visible light and seen through the viewfinder. To compensate for the shift in focus, the lens has a curved red line on the lens barrel. After focusing the image sharply through the viewfinder, check the focused distance. Then turn the focusing ring to the left until the red line lines up with the prefocused distance. [. . . ] €¢ Keep the lens cap in place whenever the lens is not in use. €¢ Attach both the front and rear caps when the lens is stored separately. [. . . ]